Method and arrangement for producing elongate support element and product, and use of the support element

ABSTRACT

A method and arrangement for producing elongate support element ( 4 ) for replacement structure ( 9 ) in jaw ( 2 ). The support element is applied to implants in the jaw with great accuracy of fit. Identification information ( 16 ) is delivered to computer equipment ( 15 ) in which supplementary information ( 17 ) is input. With the aid of the said information, the computer equipment extracts control data ( 19 ) for milling equipment ( 20 ) which mills out the support element from a blank. With the aid of the milling information ( 19 ), the milling equipment executes the support element according to the shape determined in the computer equipment. In addition, the information comprises details on the configurations of the said seats and the positioning in the support element material/blank.

TECHNICAL FIELD

[0001] The present invention relates inter alia to a method forproducing elongate support element with associated seats for replacementstructure in human body (jaw), via which seats the support element canbe applied to implants and/or to spacers on these implants. Thelongitudinal axes or centre axes of the seats connect with or areparallel to the longitudinal axes or centre axes of the implants inorder to satisfy set accuracy of fit requirements which can be about{fraction (2/100)} mm. The method starts from the stages ofidentification and possible modelling of the dental situation inquestion, supplying information, extracted from the identification andmodelling, to computer equipment, operating the computer equipment touse the supplied information and further information input to thecomputer to simulate and determine the structure of the support elementin or at the replacement structures extracting, from the computerequipment, milling coordinates information or milling coordinates dataused for controlling the milling of a blank in milling equipment,transmitting the milling coordinates information and milling coordinatesdata to the milling equipment and controlling the milling work equipmentto produce the support element from the blank.

[0002] The invention also relates to an arrangement for producingelongate support element with associated seats for replacement structurein human body/jaw, via which seats the support element can be applied toimplants and/or to spacers on these implants, where the centre axes ofthe seats are arranged to connect with or be parallel to the centre axesof the implants so that set accuracy of fit requirements are satisfied.The arrangement comprises identification members and possibly modellingmembers for identification and, respectively, modelling of therespective dental situation. Also included is computer equipment forreceiving information extracted from the identification and modelling.Also included are first transmission members for transmitting theextracted information to the computer equipment, with which, on the onehand, the structure of the support element and the positioning in or atthe replacement structure can be simulated and can be determined bymeans of the extracted information and further information input to thecomputer equipment, and, on the other hand, milling coordinatesinformation or milling coordinates data for controlling the milling of ablank in milling equipment can be executed with the aid of the saidextracted and input information. Also included are second transmissionmembers for transmitting the milling coordinates information (data) tothe milling equipment for controlling the latter to produce from theblank.

[0003] The invention also relates to a product in the form of elongatesupport element for replacement structure (for example, dental bridge)for the human body, where the support element is designed with seats viawhich the support element can be applied to implants and/or to spacerson these implants. In accordance with the above, the centre axes of theseats connect with the centre axes of the implants so that fixedaccuracy of fit requirements result.

[0004] The invention also relates to -the use of recessing directly inthe material of a blank in conjunction with the production of a dentalproduct from the blank in milling equipment.

STATE OF THE ART

[0005] The features discussed in the introduction are known per se inthe production of dental products, and also to some extent in connectionwith dental products in the form of elongate support elements of thesaid type. Reference is made to, inter alia, Swedish patents 9304042-6and 9402351-2. It is also known per se to make recesses in dentalproducts by means of so-called direct milling of the product material.

DESCRIPTION OF THE INVENTION TECHNICAL PROBLEM

[0006] In connection with the abovementioned methods and arrangementsfor producing dental products in the form of support elements, there arerequirements for very great accuracy in the seat application. Therequired accuracy is, in accordance with the above, at least about{fraction (2/100)} mm, and the requirements are set in order to be ableto satisfy exact fitting in the jaw or equivalent. Poor fitting givesrise to stresses in the dentine or equivalent and causes discomfort andpain and even collapse of the bone in question, at least in the longerterm. This has entailed comparatively technically complicated methodsand arrangements for seat applications. The said methods include, interalia, seat production by means of electro-erosion, in which a producedmodel is used as electrode part. The hitherto proposed methods andarrangements can include production of modules which are welded together(by laser welding) to form the final support element. Before the modulesare put together, seat application can take place separately in one ormore modules, for example by means of mechanical or optical measurement.However, the result of welding is a nonhomogeneous material in which thestrength varies in the support element. Cavities may possibly arise inthe material on account of the melt zone not penetrating down deepenough. When grinding or surface-machining the support element to adaptthe shape, such cavities can become exposed, which means that theexactness or fit accuracy requirements cannot be satisfied. It has alsobeen proposed to produce support parts by means of casting processes. Incasting, there is the problem that the material may buckle upon cooling.The surface fineness in the contact seats can never be better than thegrain size of the mould material. Particularly in the case of titaniumcasting, the molten metal can react chemically with the mould material,which can mean that the outermost material layer, about 1 mm thick, isheavily oxidized or forms an alloy, cf., for example in titaniumcasting, in the form of zirconium oxide in which the surface layer willconsist of an alloy of titanium and zirconium. The strength will vary inthe support element and there may be problems in obtaining support partelements with acceptable strength. In both welding and casting, thechemical composition of the surface therefore varies. In welding, theweld seam differs from the base material, and, in casting, ground areasdiffer from the raw cast surface. When ceramic is then to be baked ontothe surface to form the tooth replacement, the adhesion varies greatlyacross the surface, the result of this being that there may bedifficulties in obtaining products which are durable in the long termand which are suitable for implanting in, for example, the jaw. There istherefore a need for methods and arrangements and finished supportelements, and the use of methods known per se, which solve theabovementioned problems. The main object of the present invention is toprovide a solution to these problems.

SOLUTION

[0007] That which can principally be regarded as characterizing a methodaccording to the invention is that the milling equipment, with the aidof the said milling information or milling data, in addition toexecuting the support element shape determined in the computer equipmentfrom the blank, can also be used for control in order to mill out thesaid seats directly in or out of the blank/support element material.

[0008] The arrangement according to the invention can principally beregarded as being characterized in that the milling coordinatesinformation or milling coordinates data is designed, in addition toexecuting the support element shape determined in the computer equipmentfrom the blank using the milling equipment, also to be used to controlthe milling equipment to shape and position the said seats directly inthe blank/support element material using the information likewise set inthe computer equipment.

[0009] A product according to the invention can principally be regardedas being characterized in that the support element is made ofhomogeneous material and in that each seat wall is executed directlyfrom the homogeneous support element material.

[0010] In embodiments of the inventive concept for the product, eachseat wall can consist of a surface ground directly in the homogeneousmaterial. The product can also have a material strength around each seatwhich essentially corresponds to the material strength of the rest ofthe support element material. In a further illustrative embodiment, eachseat wall is formed directly from the support element material withoutintermediate layers of material compositions or material alterations.Each seat wall thus has the same chemical composition as the rest of thesupport element material.

[0011] A use according to the invention can be characterized in that therecessing is used for receiving the seats in the product in the form ofa support element included in tooth replacement structure. The saidseats must in this case have fixed accuracy of fit requirements in orderto be applied to implants located in the human body and/or to spacers onthese implants.

[0012] In one embodiment for recessing which is used for forming a seatin the support element with milling equipment, this milling coordinatesinformation is supplied in the form of milling coordinates data executedin database equipment and attributable to identification data on thedesign of the tooth replacement structure and supplementary data fed tothe computer equipment. The information supplied from the computerequipment to the milling equipment can be integrated on condition thatit contains milling data on the support part design and the seatdesign/the seat positions.

ADVANTAGES

[0013] By means of the measures proposed above, support elements withvery accurate seat positions can be produced at a relatively low cost.The advantages are considerable compared to casting, for example. Inthis case, a material independence is achieved, which means that theproduction can be carried out using titanium, gold or othertissue-compatible material. The seats are integrated in the material andbetter precision is obtained in the seat positions in relation to thecast support elements. The invention also affords advantages compared topartially welded bridges. In this case too, a clear materialindependence is achieved, and it is possible to avoid weld seams whichimpair the strength and require more comprehensive re-grinding. In thepresent case, very good and uniform strength can be obtained throughoutthe whole material, and the need for re-grinding is reduced.

DESCRIPTION OF THE FIGURES

[0014] A presently proposed embodiment of the method, the arrangement,the support element and the use will be described hereinbelow withreference to the attached drawing, in which:

[0015]FIG. 1 shows a block diagram of the structural parts of thearrangement, and the various manufacturing stages in the method,

[0016]FIG. 2 shows, in vertical cross-section, an example of a supportelement, and

[0017]FIG. 3 shows in vertical cross-section, and in an enlarged viewcompared to FIG. 2, a seat formation in a support element.

DETAILED EMBODIMENT

[0018] In FIG. 1, reference number 1 indicates a dental situation in theform of a mandible 2. The dental situation is such that a replacementpart in the form of a dental bridge is to be applied to implants 3incorporated in the jaw. The designs of the implants with spacers andthe like are already well known and will not be described here. In thedental situation, the dental bridge has been illustrated in its finalstate so as to indicate, in this application, a tooth replacementexample which is appropriate to the invention. The replacement structureor the dental bridge will, in the final state, comprise a support part 4and, applied to this, a tooth replacement material which is symbolizedby 5. The tooth replacement structure is placed between existing teeth 6and 7 on the patient. The implants have individual inclinations on theircentre axes, and the centre axes for two of the implants are indicatedby 8 and 9. The dental situation 1 in question which is to be read offon commencement of the work thus includes the human jaw 2, the implants3 and possibly also surrounding teeth 6 and 7. In connection with theproduction of the support element 4, modelling equipment can be usedwhich is symbolized by 10 in the figure. The cooperation between thesituation and the equipment 10 is symbolized by arrows 11.

[0019] In accordance with the invention, the dental situation is to beread off using identification equipment 12 which can also be of a typeknown per se. The reading can be effected in various ways known per se,for example by stereophotography, scanning of the outer form, etc. Thescanning of the outer form can be performed using scanning needles,optical light beams, etc. The identification function is symbolized by13 in the figure. The identification in question leads to a conversionto electrical information signals. This conversion takes place, in theillustrative embodiment, in conversion equipment 14. The conversionequipment also comprises first transmission members 14 a by means ofwhich information on the identified situation can be transmitted tocomputer equipment 15 of a type known per se in the context known perse. According to the illustrative embodiment, the transmission is donedigitally and identification data is indicated by 16. Thisidentification data is thus received in computer equipment 15 in amanner known per se. The computer equipment 15 also includes a terminal16 by means of which supplementary information is input to the computerequipment. In the illustrative embodiment, the supplementary informationis digital and has been symbolized by 17 in FIG. 1. The computerequipment comprises memory equipment and CPU which can receive andstore, and, respectively, execute the received information 16 and 17.With the aid of the last-mentioned information or data 16 and 17, thesupport element 8 can be simulated on the computer screen 15 a, forexample. This applies also to the tooth replacement structure 9 as such.By interaction with a user 18, the simulated support part 4′ can beshaped in a manner known per se for optimum construction in the toothreplacement part 9. Programs for identifying shape, positions, etc., areavailable on the market and can be used in connection with theillustrative embodiment.

[0020] With the aid of the said information 16 and 17 and the simulationwhich has been performed, milling coordinates information can thus beexecuted in the computer equipment 15. Examples of milling coordinatesdata are shown by 19 in the figure. The said milling coordinates dataare fed to machining equipment 20 of a type known per se. The saidmachining equipment consists of a mill which can mill from a blank 21not only the outer shape 21 of the support part, but also the seats 22,23 by means of which the support part 21 is to be anchored on theimplants 3 and/or on spacers (not shown) on these implants. Theinclinations and the positions of the said seats are produced using thesaid known programs in the computer equipment and are thus part of thesaid milling coordinates data 19.

[0021] In FIG. 2, the positions and inclinations of the seats are shownenlarged in relation to FIG. 1. In FIG. 2, two of the seats have beengiven reference labels 22 and 23 (cf. FIG. 1). The centre axes of theseats are indicated by 24 and 25, respectively. These centre axes mustbe adapted with great precision to the corresponding axes of inclinationof the implant (cf. the centre axes 8 and 9 in FIG. 1).

[0022]FIG. 3 shows that equipment known per se can be used for making aseat 26 in the support part material 27. In FIG. 3, a mill is indicatedby 28. In addition, a grinding member is indicated by 29. The mill canthus mill out the recess 26, after which the seat wall 26 a can bere-ground using the member 29. The known equipment 28 for making a holecan thus be used for making the seat 26 in the case according to FIG. 1.The milling equipment 20 can work in a manner known per se. In FIG. 1,second transmission members are shown by 15 c for transmitting theinformation 19 to the machining equipment 20. This transmission can bedone in a manner known per se and is symbolized by 15 d. Thus, forexample, the transmission can be done by the telephone and/or computernetwork, for example via the international computer network, theinternet. The transmission between the first transmission members 14, 14a and the computer equipment can take place on a fixed connection, forexample when the said equipment is integrated or set up in the samelocality. However, the transmission, which has been symbolized by 14 bin FIG. 1, can also take place via the telephone and/or computernetwork, for example via the said international network, the internet.Alternatively, one or both transmissions can take place with the aid ofcassettes which are sent between the localities in question.

[0023] The invention is not limited to the embodiment shown above by wayof example, but can be modified within the scope of the appended patentclaims and the inventive concept.

[0024] Method and arrangement for producing elongate support element andproduct, and use of the support element.

TECHNICAL FIELD

[0025] The present invention relates inter alia to a method forproducing elongate support element with associated seats for replacementstructure in human body (jaw), via which seats the support element canbe applied to implants and/or to spacers on these implants. Thelongitudinal axes or centre axes of the seats connect with or areparallel to the longitudinal axes or centre axes of the implants inorder to satisfy set accuracy of fit requirements which can be about{fraction (2/100)} mm. The method starts from the stages ofidentification and possible modelling of the dental situation inquestion, supplying information, extracted from the identification andmodelling, to computer equipment, operating the computer equipment touse the supplied information and further information input to thecomputer to simulate and determine the structure of the support elementin or at the replacement structure, extracting, from the computerequipment, milling coordinates information or milling coordinates dataused for controlling the milling of a blank in milling equipment,transmitting the milling coordinates information and milling coordinatesdata to the milling equipment and controlling the milling work equipmentto produce the support element from the blank.

[0026] The invention also relates to an arrangement for producingelongate support element with associated seats for replacement structurein human body/jaw, via which seats the support element can be applied toimplants and/or to spacers on these implants, where the centre axes ofthe seats are arranged to connect with or be parallel to the centre axesof the implants so that set accuracy of fit requirements are satisfied.The arrangement comprises identification members and possibly modellingmembers for identification and, 9304042-6 and 9402351-2. It is alsoknown per se to make recesses in dental products by means of so-calleddirect milling of the product material.

DESCRIPTION OF THE INVENTION TECHNICAL PROBLEM

[0027] In connection with the abovementioned methods and arrangementsfor producing dental products in the form of support elements, there arerequirements for very great accuracy in the seat application. Therequired accuracy is, in accordance with the above, at least about{fraction (2/100)} mm, and the requirements are set in order to be ableto satisfy exact fitting in the jaw or equivalent. Poor fitting givesrise to stresses in the dentine or equivalent and causes discomfort andpain and even collapse of the bone in question, at least in the longerterm. This has entailed comparatively technically complicated methodsand arrangements for seat applications. The said methods include, interalia, seat production by means of electro-erosion, in which a producedmodel is used as electrode part. The hitherto proposed methods andarrangements can include production of modules which are welded together(by laser welding) to form the final support element. Before the modulesare put together, seat application can take place separately in one ormore modules, for example by means of mechanical or optical measurement.However, the result of welding is a nonhomogeneous material in which thestrength varies in the support element. Cavities may possibly arise inthe material on account of the melt zone not penetrating down deepenough. When grinding or surface-machining the support element to adaptthe shape, such cavities can become exposed, which means that theexactness or fit accuracy requirements cannot be satisfied. It has alsobeen proposed to produce support parts by means of casting processes. Incasting, there is the problem that the material may buckle upon cooling.The surface fineness the support element shape determined in thecomputer equipment from the blank using the milling equipment, also tobe used to control the milling equipment to shape and position the saidseats directly in the blank/support element material using theinformation likewise set in the computer equipment.

[0028] A product according to the invention can principally be regardedas being characterized in that the support element is made ofhomogeneous material and in that each seat wall is executed directlyfrom the homogeneous support element material.

[0029] In embodiments of the inventive concept for the product, eachseat wall can consist of a surface ground directly in the homogeneousmaterial. The product can also have a material strength around each seatwhich essentially corresponds to the material strength of the rest ofthe support element material. In a further illustrative embodiment, eachseat wall is formed directly from the support element material withoutintermediate layers of material compositions or material alterations.Each seat wall thus has the same chemical composition as the rest of thesupport element material.

[0030] A use according to the invention can be characterized in that therecessing is used for receiving the seats in the product in the form ofa support element included in tooth replacement structure. The saidseats must in this case have fixed accuracy of fit requirements in orderto be applied to implants located in the human body and/or to spacers onthese implants.

[0031] In one embodiment for recessing which is used for forming a seatin the support element with milling equipment, this milling coordinatesinformation is supplied in the form of milling coordinates data executedin database equipment and attributable to identification data on thedesign of the tooth replacement structure and supplementary data fed tothe computer equipment. The information supplied from the -7

DETAILED EMBODIMENT

[0032] In FIG. 1, reference number 1 indicates a dental situation in theform of a mandible 2. The dental situation is such that a replacementpart in the form of a dental bridge is to be applied to implants 3incorporated in the jaw. The designs of the implants with spacers andthe like are already well known and will not be described here. In thedental situation, the dental bridge has been illustrated in its finalstate so as to indicate, in this application, a tooth replacementexample which is appropriate to the invention. The replacement structureor the dental bridge will, in the final state, comprise a support part 4and, applied to this, a tooth replacement material which is symbolizedby 5. The tooth replacement structure is placed between existing teeth 6and 7 on the patient. The implants have individual inclinations on theircentre axes, and the centre axes for two of the implants are indicatedby 8 and 9. The dental situation 1 in question which is to be read offon commencement of the work thus includes the human jaw 2, the implants3 and possibly also surrounding teeth 6 and 7. In connection with theproduction of the support element 4, modelling equipment can be usedwhich is symbolized by 10 in the figure. The cooperation between thesituation and the equipment 10 is symbolized by arrows 11.

[0033] In accordance with the invention, the dental situation is to beread off using identification equipment 12 which can also be of a typeknown per se. The reading can be effected in various ways known per se,for example by stereophotography, scanning of the outer form, etc. Thescanning of the outer form can be performed using scanning needles,optical light beams, etc. The identification function is symbolized by13 in the figure. The identification in question leads to a conversionto electrical information signals. This conversion takes place, in theillustrative embodiment, in conversion equipment 14. The conversionequipment known programs in the computer equipment and are thus part ofthe said milling coordinates data 19.

[0034] In FIG. 2, the positions and inclinations of the seats are shownenlarged in relation to FIG. 1. In FIG. 2, two of the seats have beengiven reference labels 22 and 23 (cf. FIG. 1). The centre axes of theseats are indicated by 24 and 25, respectively. These centre axes mustbe adapted with great precision to the corresponding axes of inclinationof the implant (cf. the centre axes 8 and 9 in FIG. 1).

[0035]FIG. 3 shows that equipment known per se can be used for making aseat 26 in the support part material 27. In FIG. 3, a mill is indicatedby 28. In addition, a grinding member is indicated by 29. The mill canthus mill out the recess 26, after which the seat wall 26 a can bere-ground using the member 29. The known equipment 28 for making a holecan thus be used for making the seat 26 in the case according to FIG. 1.The milling equipment 20 can work in a manner known per se. In FIG. 1,second transmission members are shown by 15 c for transmitting theinformation 19 to the machining equipment 20. This transmission can bedone in a manner known per se and is symbolized by 15 d. Thus, forexample, the transmission can be done by the telephone and/or computernetwork, for example via the international computer network, theinternet. The transmission between the first transmission members 14, 14a and the computer equipment can take place on a fixed connection, forexample when the said equipment is integrated or set up in the samelocality. However, the transmission, which has been symbolized by 14 bin FIG. 1, can also take place via the telephone and/or computernetwork, for example via the said international network, the internet.Alternatively, one or both transmissions can take place with the aid ofcassettes which are sent between the localities in question.

[0036] The invention is not limited to the embodiment shown above by wayof example, but can be modified within the scope of the appended patentclaims and the

1. Method for producing elongate support element (21) with associatedseats (22, 23) for replacement structure (9) in human body (jaw) (2),via which seats (22, 23) the support element can be applied to implants(or to spacers on these implants), where the longitudinal axes (centreaxes) of the seats connect with or are parallel to the longitudinal axes(centre axes) of the implants in order to satisfy set accuracy of fitrequirements ({fraction (2/100)} mm), the method comprising the stagesof: a) identification (13) and possible modelling (11) of the dentalsituation (1) in question, b) supplying information (16) extracted fromstage a) to computer equipment, c) operating the computer equipment touse the supplied information (16) and further information (17) input tothe computer equipment to simulate and determine the structure (4, 4′)of the support element in or at the replacement structure (9), d)extracting, from the computer equipment (15), milling coordinatesinformation (data) (19) used for controlling the milling of a blank inmilling equipment (20), e) transmitting the milling coordinatesinformation (data) (19) to the milling equipment (20), f) controllingthe milling equipment to produce the support element from the blank,characterized in that f) the milling equipment, with the aid of the saidmilling information (data), in addition to executing the support elementshape determined in the computer equipment from the blank, can also beused for control in order to mill out the said seats (22, 23) directlyfrom the blank/support element material.
 2. Arrangement for producingelongate support element (4, 21) with associated seats for replacementstructure (9) in human body (jaw) (2), via which seats the supportelement can be applied to implants (or to spacers on these implants)(3), where the centre axes (24, 25) of the seats are arranged to connectwith or be parallel to the centre axes (8, 9) of the implants so thatset accuracy of fit requirements ({fraction (2/100)} mm) are satisfied,and where the arrangement comprises identification member (12) andpossibly modelling member (10) for identification (13) and,respectively, modelling (11) of the respective dental situation,computer equipment (15) for receiving information (16) extracted fromthe identification and modelling, and first transmission members (14)for transmitting the extracted information to the computer equipment(15), with which, on the one hand, the structure (21) of the supportelement and the positioning in or at the replacement structure can besimulated and can be determined by means of the extracted informationand further information (17) input to the computer equipment, and, onthe other hand, milling coordinates information (data) (19) forcontrolling the milling of a blank in milling equipment (20) can beexecuted with the aid of the said extracted and input information, andsecond transmission members (15 a) are arranged for transmitting themilling coordinates information (data) to the milling equipment (20) forcontrolling the latter to produce the support element from the blank,characterized in that the milling coordinates information (data) (19) isdesigned, in addition to executing the support element shape determinedin the computer equipment from the blank using the milling equipment,also to be used to control the milling equipment to shape and positionthe said seats (22, 23) directly in the blank/support element material(27).
 3. Product produced using the method and the arrangement accordingto Patent claims 1 and 2, respectively, in the form of elongate supportelement (21) for replacement structure (9), for example in the form of adental bridge, for the human body, where the support element is designedwith seats (22, 23) via which the support element can be applied toimplants (3) and/or to spacers on these implants, where the centre axes(24, 25) of the seats connect with the centre axes (8, 9) of theimplants so that fixed accuracy of fit requirements (of at least about{fraction (2/100)} mm) result, characterized in that the support elementis made of homogeneous material (27) and in that each seat wall (26 a)is executed directly from the homogeneous support element material (27).4. Product according to Patent claim 3, characterized in that each seatwall consists of a surface (26 a) ground directly in the homogeneousmaterial.
 5. Product according to Patent claim 3 or 4, characterized inthat the material strength around each seat has essentially the samematerial strength as the rest of the support element material (27). 6.Product according to Patent claim 3, 4 or 5, characterized in that eachseat wall (26 a) is formed directly from the support element material(27) without intermediate layers of material compositions or materialalterations.
 7. Product according to any of Patent claims 3-6,characterized in that each seat wall (26 a) has the same chemicalcomposition as the rest of the support element material (27).
 8. Use ofrecessing (26) directly in the material (27) of a blank in conjunctionwith the production of a dental product from the blank in millingequipment (20), characterized in that the recessing is used forreceiving the seats (22, 23) in the product in the form of a supportelement (4) included in tooth replacement structure (9), the seats (22,23) of which with set accuracy of fit requirements (at least about{fraction (2/100)} mm) are to be applied to implants located in thehuman body and/or to spacers on these implants.
 9. Use according toPatent claim 8, characterized in that the recessing (26) is used forforming a seat in the support element in milling equipment (20) which isfed milling coordinates information in the form of milling coordinatesdata (19) executed in computer equipment (15) and attributable toidentification data (16) and supplementary data (17) fed to the computerequipment (15).
 10. Use according to Patent claim 8 or 9, characterizedin that the recessing (26) is used for forming a seat in support element(21) in milling equipment (20) which is fed integrated milling data (19)on the support element design and seat design and the seat positions inthe support element.